10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Ultimate goal is to delete lines from before and after a block of lines in a given file. First attempt was something like this:
sed -e '1,/STARTUP/ d' inputfile.txt > outputfile.txt
but that deleted everything down to and including the line with STARTUP. I need to delete everything before... (6 Replies)
Discussion started by: edstevens
6 Replies
2. Shell Programming and Scripting
if ! grep -q "aa" $line;then
if ! grep -q "bb" $line;then
somthing
fi
fi (2 Replies)
Discussion started by: yanglei_fage
2 Replies
3. Shell Programming and Scripting
How do you get the contents of a line directly after a selected one? Also, how about before it? I am using CSH and don't have any GNU products installed.
Input file:
apple
orange
plum
So say I use grep on orange...how do I get plum (this line can be different so I can't just grep... (4 Replies)
Discussion started by: thibodc
4 Replies
4. UNIX Desktop Questions & Answers
i have a line that has ",,", i need to change it to "," ; But i have it more than one time in the same line , sub(",,",",",$0) just sub the first one in the line?
---------- Post updated at 08:15 AM ---------- Previous update was at 08:15 AM ----------
using AWK please (2 Replies)
Discussion started by: Reham.Donia
2 Replies
5. Shell Programming and Scripting
hi! i researched about comparing two columns here and got an answer. but after examining my two files, i found out that the first columns of the two files are not unique with each other. all i want to compare is the 2nd and 3rd column.
FILE 1:
ABS 456 315
EBS 923 163
JYQ3 654 237
FILE 2:... (1 Reply)
Discussion started by: engr.jay
1 Replies
6. Shell Programming and Scripting
I want to delete a line between selected lines using sed:
e.g. : Between "bus" to "pins", delete lines conaining "signal" word.
Input :
bus
direction
signal new
signal old
pins
signal ok
end
Desired Output:
bus
direction
pins
signal
end (4 Replies)
Discussion started by: nehashine
4 Replies
7. Shell Programming and Scripting
Hello,
I want to change a line at file whit a script
i want to change line 150 for example, write hello and remove text of this line
EXAMPLE
LINE 150: my mother
change to:
LiNE 150: HELLO (4 Replies)
Discussion started by: uri_crack
4 Replies
8. Shell Programming and Scripting
I am trying to print 1st, 2nd, 13th and 14th fields of a file of line numbers from 29 to 10029. I dont know how to put this in one code. Currently I am removing the selected lines by
awk 'NR==29,NR==10029' File1 > File2
and then doing
awk '{print $1, $2, $13, $14}' File2 > File3
Can... (3 Replies)
Discussion started by: ananyob
3 Replies
9. Shell Programming and Scripting
Hello Experts,
I am working on a small file editing script. Since all experts here are very generous to give me the complete code, I would take up the problem in steps so that I ensure my opportunity to learn.
AIM: The script has some commented and some uncommented lines. I need to :
... (2 Replies)
Discussion started by: hkansal
2 Replies
10. Shell Programming and Scripting
Hi,
I'm struggling to write a script to do the following,
-will go through each line in the file
-in a specific character positions, changes
the value to a new value
-These character positions are fixed througout the file
-----------------------
e.g.: file1.sh will have the following 3... (4 Replies)
Discussion started by: vini99
4 Replies
CRON(8) System Manager's Manual CRON(8)
NAME
cron - daemon to execute scheduled commands (ISC Cron V4.1)
SYNOPSIS
cron [-l load_avg] [-n]
DESCRIPTION
Cron should be started from /etc/rc or /etc/rc.local. It will return immediately, so you don't need to start it with '&'. The -n option
changes this default behavior causing it to run in the foreground. This can be useful when starting it out of init.
Cron searches /var/spool/cron for crontab files which are named after accounts in /etc/passwd; crontabs found are loaded into memory. Cron
also searches for /etc/crontab and the files in the /etc/cron.d directory, which are in a different format (see crontab(5)). Cron then
wakes up every minute, examining all stored crontabs, checking each command to see if it should be run in the current minute. When execut-
ing commands, any output is mailed to the owner of the crontab (or to the user named in the MAILTO environment variable in the crontab, if
such exists).
Additionally, cron checks each minute to see if its spool directory's modtime (or the modtime on /etc/crontab) has changed, and if it has,
cron will then examine the modtime on all crontabs and reload those which have changed. Thus cron need not be restarted whenever a crontab
file is modified. Note that the Crontab(1) command updates the modtime of the spool directory whenever it changes a crontab.
Daylight Saving Time and other time changes
Local time changes of less than three hours, such as those caused by the start or end of Daylight Saving Time, are handled specially. This
only applies to jobs that run at a specific time and jobs that are run with a granularity greater than one hour. Jobs that run more fre-
quently are scheduled normally.
If time has moved forward, those jobs that would have run in the interval that has been skipped will be run immediately. Conversely, if
time has moved backward, care is taken to avoid running jobs twice.
Time changes of more than 3 hours are considered to be corrections to the clock or timezone, and the new time is used immediately.
PAM Access Control
On SUSE LINUX systems, crond now supports access control with PAM - see pam(8). A PAM configuration file for crond is installed in
/etc/pam.d/crond . crond loads the PAM environment from the pam_env module, but these can be overriden by settings in the crontab file.
SIGNALS
On receipt of a SIGHUP, the cron daemon will close and reopen its log file. This is useful in scripts which rotate and age log files.
Naturally this is not relevant if cron was built to use syslog(3).
CAVEATS
In this version of cron, /etc/crontab must not be writable by any user other than root. No crontab files may be links, or linked to by any
other file. No crontab files may be executable, or be writable by any user other than their owner.
SEE ALSO
crontab(1), crontab(5), pam(8)
AUTHOR
Paul Vixie <vixie@isc.org>
4th Berkeley Distribution 10 January 1996" CRON(8)
